Operation Manual

44 GMC-I Messtechnik GmbH
Measurements R
SL
– MΩ
ISO
@10 V/100 V – CAP Switch positions (a-b) (a-E) (b-E)
6 Measurements in Symmetrical Copper Cable Networks
6.1 “R
SL
” Loop Impedance Measurement with 2 mA Constant Current
Ð Disconnect supply power from the electrical circuit of the
device to be measured, and discharge all high-voltage
capacitors.
Ð Make sure that the device under test is voltage-free.
Interference voltages distort measurement results!
Ð Set the rotary switch to R
SL
.
RSL appears at the display.
Ð Connect the measuring point under test as shown.
Depending upon the selected limit value / threshold, the
multimeter generates a continuous acoustic signal if the
respective value is exceeded.
“0L” appears at the display in the case of an open connection.
The limit value can be adjusted in the “SETUP ” menu (see also
chapter 7.4):
1nFo
 ...  SET r AtE  ...  r_sl
> 100, 200 Ω, 2 ... 3 kΩ, 0L 
(2 = default setting)
Note
This measurement is particularly geared to the measure-
ment in copper cable networks.
MEASURE
SETUP
FUNC
ENTER
FUNC
ENTER
FUNC
ENTER
COM mA A
V
Temp
Ω
aEb
R
x
R
x
0V !
!
00.000
k Ω
R
SL
000.8
Ω
R
SL
: 300 Ω/3 kΩ
Measuring Ranges:
R
SL
FUNC
ENTER
R
SL
> 100, 200 Ω, 2 ... 3 kΩ, OL
0.443
V
DC
FUNC
ENTER
RSL
(0,1 Ω ... 3,1 kΩ)